Suction cleaner



Sept. 16, .1941. I

W. G. KILPATRICK SUCTION CLEANER Filed April 25, 1958 3 Sheets-Sheet 1 YINVENTOR IVil/bfd 6: Ki l wink]:

ATTORNEY S p 1941- w. s. KILPATRICK SUCTION CLEANER Filed April 23, 19383 Sheets-Sheet 2 Wil/bn] a. $915??? ATTORNEY Sept. 16, 1941. w.KILPATRICK 2,255,788

SUCTION CLEANER Filed April 25, 1938- s Sheets-Shet 5 INVENTOR ATTORNEYPatented Sept. 16, 1941 SUCTION panama Wilford G. Kilpatrick, Canton,Ohio, aasignor to The Hoover Company, North Canton, Ohio, a

corporation of Ohio ApplicationApril 23, 1938, Serial No. 203,725

26 Claims. (Cl. -8)

The present invention relates to suction cleaners in general andparticularly to new and novel surface agitating means in suctioncleaners.

More specifically the invention comprises a rotary agitator in a suctioncleaner which is provided with surface-contacting agitating elementssubjected to wear in use, and which are mounted which are automaticallyadjustable to compensate for wear. A still further object of theinvention is to provide arotary agitator in a suction cleaner whichagitator includes both rigid beating elements and flexible brushelements subjected to wear, the brush elements being so mounted thatthey areautomatically adjusted to compensate for wear. A still furtherobject of the invention is to provide a rotary agitator in a suctioncleaner in which the agitating elements subjected to wear areautomatically repositioned upon each use. Still another object of theinvention is to provide a rotary agitator in which the brush bristlesare readjusted to an optimum position at each use. These and other morespecific objects will appear upon reading the following specificationand claims and upon considering in connection therewith the attacheddrawings to which they relate.

Referring now to the drawings in which the same reference charactersrefer to the same parts throughout, and in which preferred embodimentsof the present invention are disclosed:

Figure l is a front view of a suction cleaner embodying an agitatorconstructed in accordance with the present invention the cleaner nozzlebeing shown in section to disclose the agitator positioned therein;

Figure 2 is an enlarged partial longitudina section through theagitator;

Figure 3 is a longitudinal view of the interconnected pivoted linkplates which are attached to the radially movable brushes;

Figure 4 is a section upon the line 4-4 of Figure 1 and discloses thebrushes positioned as with the agitator running;

Figure 5 is a view looking in the direction of the arrows upon the line5-5 of Figure 1;

.Figure 6 is a section upon the line 6-8 of Figure 2 and shows therelationship of parts with the agitator running;

Figure 7 is a view similiar to Figure 6 and shows the relationship ofparts with the agitator standing;

Figure 8 is a section upon the line 8-8 of Figure'fi;

Figure 9 is a section upon the line 9-8 of Figure6; 7 Figure 10 is aview in perspective of the centrifugal weight;

Figure 11 is a section similar to Figure 6 through a second preferredembodiment of the invention with the parts in the running relationship;

Figure 12 is a view similar to Figure 11 but with the parts in thestanding-relationship;

Figure 13 is a section similar to Figures Gland 11 through a thirdembodiment of the invention with the agitator partsin the runningrelationship;

Figure 14 is a view similar to Figure 13 with the agitator parts in thestanding relationship. In the modern suction cleaner, the surfaceagitating means cooperate with the moving air stream to efiect dirtremoval from the surface covering undergoing cleaning. Thesurface-agitating means in the cleaner normally comprise a rotatingagitator body provided withrigid beating elements and flexible brushingelements. In operation the rigid beating elements, being made of hardmetal are not subjected to wear. They extend, throughout the length oflife of the agitator to substantially the same radial distance from thecenter of rotation. The flexible brushing elements, however, usuallycomprise bristles which gradually wear away through repeated contactswith the surface covering undergoing cleaning; resulting in a decreasein their length.

n the flexible brushing elements are fixedly seated in the agitatorwithin a relatively short "period of time the bristles of the brusheswear down until the brush elements do not extend This function isaccomplished by new and novel means in a manner which will behereinafter described.

Referring again to the drawings and to Fisures 1 to 10, inclusive. inparticular, the first preferred embodiment of the invention isdisclosed. A modern suction cleaner Ls illustrated having a casing whichincludes a nozzle I having surfacecontacting lips 2 and 3, a fan chamber4 and a motor casing 5. An unshown motor within the casing 5 is formedwith a downwardly extending means by which the machine can be propelledover a surface covering undergoing cleaning. Removably positioned withinthe nozzle I, in such position that it is adapted to contact a raisedsurface covering between the nozzle lips 2 and 3,

is a rotary agitator l4 upon the cylindrical body l5 of which extendrigid helical beater bars l8,

l8. Brush seats l1, l1 extend longitudinally in the body libetween thebeater elements and positioned therein are brushes l8, l8 formed withrigid backs l8, l9. Agitator body I! is formed near its center with acircumferential groove which functions as a pulley, indicated by thereference character 2|, and which is adapted to seat apower-transmitting belt 22 extending rearwardly into drivingrelationship with the lower end of the motor shaft 8 in a common andwell known manner forming no part of the present invention.

The agitator is rotatably mounted within the nozzle by its supportingshaft 24, the extended ends of which are removably seated. in avcommonmanner, within retaining means in the end walls of nozzle l. The shaft24 is itself non-rotatable and the body I5 is rotatably carried thereonby a suitable bearing 25 at each of its ends which is positioned betweenthe shaft and the cupshaped end wall 28. A thread guard 21 seats inscrew threaded relationship upon the outer end oi shaft 24 and contactsthe inner race of bearing 25 to retain it against a shoulder formed byan enlarged portion 28 of the shaft. In normal operation'the agitatorrotates about the shaft 24 under the rotative force received from thepowertransmitting belt 22 which is itself driven by the shaft 8 of thedriving motor. Contact with the surface covering undergoing cleaning iseffected as the latter is lifted into contact with the' agitator andwith the surface-contacting lips 2 and 3 by the suction within thenozzle I created by the suction-creating fan I.

j According to the present invention the brushes l8, l8 are slidableradially within their seats l1, l1, and means are provided which adjusteach brush to the desirable radial position. The adjusting meanspositioned within the agitator,

comprise, according to this embodiment 'of the invention, a centrifugalweight 38 which is pivoted to an inner body-carried wall 3|, locatedadjacent the outer end of each brush seat ll, about a pivot pin 32.Weight 34 is adapted to contact the inner wall of cylindrical body 15 inits outer radial position and is at all times urged inwardly by thespring 38 the end of which slidingly seats within a slot 34 formed inthe side of weight 30.

The inner side of the weightis toothed, i s indicated at 85, for apurpose which will hereinafter be apparent. In addition to being shapedto conform to the internal contour of cylinder .the weight 30 is alsoformed in the shape of an L between its ends and at the junction of thearms of the L is pivoted a lever arm 38 upon a pin 39. The end of thelever 38 which extends from the weight 30 is provided with teeth 40whfle the portion which extends along and adjacent the weight 30 isformed upon one side as a cam surface 4|. A coil spring 42 carried bythe pin 39 at all times urges the lever 38 clockwise as viewed 'inFigures 6 and 7 to hold the cam surface 4! against a stop pin 42throughout the angular movement of the weight 30 under centrifugalforce.

With the agitator rotating the centrifugal weight 30 is thrown outwardlyagainst the innerside of the enclosing agitator shell i5, as shown inFigure 6, but the strength of spring 33 is such 'that with'the agitatorstanding the weight is by links 52 and 53 to the ends of rods 55, 55which are, as is clearly seen in Figures 4, 6 and '7, positioned at thesides of the supporting shaft 24 and extend parallel thereto. Each rodis supported at each end within a slot 56 formed in the interior plate3|. The angularity of the links 52 and 53 is such that rotation of plate48. in one direction serves to move the rods 55, 55 radially inward intheir supporting slots 56, 56 while rotation of the plate in the oppositdirection tends to move the rods outwardly.

A link plate 51 connects each rod55 to a rigid brush back IS, the backbeing slidable within its own seat II. As is clearly seen in Figure 3,the link plates pivotally enclose, the rods 55, 55 and are connected attheir opposite sides by 'anelongated bolt 58 carried by inwardlyextending lugs '20, 20 formed on each brush back Hi. It is clear fromthe relationship of parts that as the brush elements move radiallyoutward the rods'55, 55 will be drawn radially inward and' toward eachother, and that a movement of the rods 55, 55

radially outward will result in'an inward radial movement of the brushelements l8. As both brushes l8, l8 are joined to the longitudinallyextending rods 55, 55 it is clear that the movement of the brushes willbe conjoint. The opposite ends of the agitator are identical. Within thenozzle at spaced points are stop rings 60, 60 which encircle in spacedrelationship the agitator within the nozzle adjacent the brush elementsl8, l8. Each stop ring 60 comprises a smooth metal element which opensdownwardly and which is fixed within the nozzle *through having itslower overturned ends secured to the nozzle walls by screws 8|, 6|.Thesestop rings, being spaced radially beyond the rigid beater elementsl6, l8, cannot be contacted thereby and are of such limited extentlongitudinally of the agitator that they do not interfere with thefreeflow of air through the nozzle or with the foreign material which iscarried therethrough.

The operation of the agitator constructed in {accordance with thepresent invention is as folows:

The agitator in the standing position, that is not rotating, isillustrated in Figure 7. The force exerted by the spring 33 has forcedthe weight 35 radially inward until its teeth 35 have meshed with theteeth 49 upon the rotatable plate 48.

When so engaged the plate 48 cannot rotate,

the rods 55, 55 are held fixed by the links 52 and 53, andaccordinglythe radial position of each brush I8 is determined as itsrigid back I9 is connected by the link plates 51, to the rods 55,55.When the cleaner is placed in operation and the agitator begins torotate, upon reaching a certain speed the centrifugal force exerted bythe weight 30 will exceed slightly the opposing force exerted by thespring 33 and the weight will move radially outwardly to a sufficientextent to disengage the teeth 35 and 49 of the weight and of the plate48, respectively. There is then nothing to oppose the outward radialmovement of the brush elements I3, l8 under centrifugal force and thoseter, and before the agitator completely stops, the brushes will againfly outwardly under centrifugal force and upon the weight 35 beingforced by the times in contact with astop shoe or ring. As

the speed of the agitator increases the centrifugal weight -is thrownradially outward and approaches the inner wall of the agitator body l5.Before actual contact of the weight with the wall is made the weight haspivoted to a sufiicient extent that the lever arm 38, which it carriesand which moves therewith, has been moved sufficiently to engage itsteeth with the teeth 55 formed upon the rotatable'plate 48. The lever 38is not rigid with the weight 30 but changes its angular positionrelative thereto as the cam surface 4| formed'thereon slides upon thepin 43. Contact of the lever arm teeth 40 with the teeth of plate 48does not prevent further outward radial movement of the weight 38 whichinstead continues to move until it contacts the inner surface of theenclosing cylindrical agitator wall t5. This additional movement of thecentrifugal weight, that is, the movement which takes place followingthe contact of the teeth 40' with the teeth 50, causes the arm 38 tobedrawn clockwise about the pivot 32, as viewed in Fig ures 6 and '7,thereby causing the plate 48 to rotate in a counter-clockwise manner, asillustrated in those two figures, resulting in the outward radialmovement of the rods 55, which are connected thereto through the links52 and 53.

As explained above. such .outwardradial movegal force from that positionto its outermost position at which it contacts the inner surface of thebody IS the lever arm moves the plate an-' gularly through a definitearc. The displace-' ment inwardly of the brush elements effected by thatrotation of the rocker plate 48 is just sufficient to move them fromcontact with the en-' closing shoes 50, to reduce their radial ex-.

spring 33 into engagement with the rocker plate 48 the brusheswill belocked at whatever radial adjustment they then have. Restarting thecleaner results in a repetition of the operation which positions thebrushes in their operating relationship. Referring now to Figures 11 and12in particular a second preferred embodiment of the invention isdisclosed which differs from that previously described, only in thespecific centrifugal weight and lever arm mechanism which adjusts thebrush. In the first described embodiment the centrifugal weight hadpivoted upon it the adjusting lever arm, whereas in the presentembodiment the centrifugal weight and the adjusting lever'arm arerigidly connected. According to this embodiment the rocker plate 10. isprovided with toothed sectors II and I2 and is rotatable, as in thefirst embodiment, upon the hub 45 of the supporting plate 3| within theagitator body l5. Links 52 and 53 again connect the rocker plate to thelongitudinally extending arms 55, 55 and, as in the first embodiment,rotation of the rocker plate 15 results in radial adjustment of thebrushes I8, l8. The centrifugal weight in the present embodiment isindicated by the reference character I5 and is formed at its outer endwith teeth 16 adapted to mesh with the teeth upon the rocker plate 15.Weight 15 is pivoted upon the agitator wall 3| by a pivot pin 'I'l whichis encircled by a coil spring I8 exerting at all times a force to pivotthe weight 15 inwardly and which is opposed by the centrifugal force ofthe weight in the rotation of the agitator. Upon the opposite side ofthe pivot pin 11 from the teeth 16 the centrifugal weight 15 is formedas a lever 80 having a single tooth 8| at its outer end which is adaptedto engage the teeth 12 also formed upon the rocker thrown outwardly bycentrifugal force in the rotation of the agitator causing its teeth I8to disengage the rocker plate teeth II, the weight having been held inthat position by the spring 18. Thereupon the brushes l8 which areconnected to the rocker plate I0 through the links 52 and 53 and therods 55, 55, as in the first embodiment, fly outwardly into contact withthe stop plate 80. Contact with the stop plate marks the outer radiallimit of brush movement. Thereafter and upon the continued movement ofthe centrifugal weight 15 the tooth 8| of its lever arm 80, engages theteeth 12 of the plate Ill. The length of the lever arm 80 is such thatthe first contact of the tooth 8| with the teeth 12 is not a bindingcontact but instead one which permits of the further movement of theweight a l5 outwardly under centrifugal force. This furtension to thatof the rigid beater elements |8, I5. I

During the continued rotation of the agitator the situation andcondition therein does not change, but upon the motor being turnedofi'and the agitator gradually decreasing its speed the spring force exertedby spring 33 will at some point overcome the centrifugal force exertedby the weight 35 and that element will be forced inwardly therebyreleasing the lever arm 38 from engagement with the rocker plate 48.Thereafth'er movement causes the lever arm 88 to pivot and to rotate therocker plate I0 resulting in the movement of the links 52 and 53 and theinward movement of the brushes as in the first embodiment.

As in the first embodiment the centrifugal weight moves through adefinite arc after its plate-rotating lever has engaged the plate andaccordingly the plate is always rotated a fixed amount to draw thebrushes inwardly a fixed distance from the stops 68, regardless of theposition of the plate when engaged by the lever;

- This plate position would, of course, vary as the brush became wornand its bristles shorter.

Upon the agitator coming to a stop when cleaner operation isdiscontinued the operationis substantially the reverse. As the agitatorspeed decreases to a certain point the force exerted by the spring 18overcomes the centrifugal force exerted by the weight 15 and pivots itinwardly thereby disengaging the lever or pawl 88 from the teeth 12. Thebrushes l8 then tend to fly out and are locked in this outer position asclearly illustrated in Flgure12, by the cooperation of of the teeth 18with the teeth 1|.

Referring now to Figures 13 and 14 the third preferred embodiment of theinvention is disclosed. In this embodiment the brushes H! are,

as in the first two embodiments, suitably connected by link plates to.the radially slidable rods 55, 55 positioned in the slots 58,55 in theagitator plates 8|. However, in the present embodiment the ends of therods 55, 55 are squared and carry pinions 88, 8B which mesh with theteeth 89, 88 of a rack 88 carried by the wall 3|. The centrifugal weight82 in the present embodiment is again pivoted to the agitator wall 8|and by a pin 93. Weight 92 is formed with teeth 84 and beyond its pivotpin 93 is formed, as in the second embodiment, with a lever arm which-isdenoted by the reference character 85 which is itself formed with teeth85. A coil spring 81 again encloses the pivot pin 93 of the weight andat all times urges the weight inwardly.

The relationship of the brush adjusting parts is as illustrated inFigure 14 with the brush standing. The centrifugal weight 92 has beenforced radially inward under the action of the spring 91 until the teeth84 at its inner end have meshed with the pinion 88, thereby securing itin place upon the rack 90 and preventing radial movement of thebrush-connecting rods 55, 55. As the rods-are connected bylink plates51, 51, as illustrated in Figure 3, a construction common to all threeembodiments of the invention, the locking of one pinion 88 prevents themovement of both rods 55, 55 and so of the brush elements l8. Upon therotation of the agitator and upon reaching a predetermined speed,centrifugal force moves the weight 82 outwardly againstthe force exertedby the spring 81 and the teeth 84 disengage the pinion 88. Thereupon thebrushes I8 can move radially outward until they contact the stop shoes80. .The continued pivotal movement of the weight 92 under centrifugalforce causes the teeth 88 of the latch lever 85 to contact the secondpinion 88 thereby locking the construction in fixed position and I 1preventing further movement of the-parts during the operation of thedevice. As distinguished from the first two embodiments of the inventionthe lever 85 serves merely to latch or look the brush l8 in place anddoes not serve to withdraw it radially inward from its contact with thestop .shoes 58.

as set forth by the appended claims.

I claim:

1. In a rotary agitator for a suction cleaner, an agitating elementsubject to decrease in size with wear, means mounting said element forradial adjustment relative to the axis of rotation, and means controlledby the rotation of said element to reposition and fix said element in apredetermined optimum position under predetermined conditions ofoperation.

2. In a rotary agitator for a suction cleaner, a body, a brushadjustable relative to said body to compensate for wear, means to fixthe position of said brush relative to said body and to release saidbrush under predetermined conditions, and means to adjust said brush toa predetermined optimum position under predetermined conditions ofoperation.

3. In combination in a rotary agitatorfor suction cleaners, a brushmovable radially with respect to the axis of rotation, means to securesaid brush in a fixed radial position when said agitator is inoperativeand to release said brush at a predetermined speed of rotation, andmeans to secure said brush at a fixed radial position at a predeterminedhigher speed of rotation.

4: In a suction cleaner, a rotatable agitator including an agitatingelement subject to wear, stationary stop means adjacent said agitatoradapted to limit the radial extension of said brush in the rotation ofthe agitator, and automatic means to move said brush and to lock saidbrush at a predetermined fixed optimum extension which is less than theextension at which said element contacts said stop.

5. In a suction cleaner, a rotatable agitator, an agitating elementradially movable relative to the axis 'of rotation by centrifugal forceand having an optimum position, stationary means to limit'the outwarddisplacement of said element to a radial extension slightly greater thanits optimum position, and agitator-operated means 6-. In a suctioncleaner,.a rotatable agitator,v

an agitating element movable radially with respect to the axis ofrotation of said agitator by centrifugal force, means to preventmovement of said element below a predetermined speed of rotation only,stationary means to limit the outward displacement of said element, andmeans operative at a higher speed to retain said element at a fixedradial extension.

7. In a suction cleaner, a rotatable agitator, an agitating elementmovable radially with respect to the axis of rotation of said agitatorby centrifugal force, means to prevent movement of said element below apredetermined speed of rotation only, stationary means to limit theout--v ward displacement of said element, and means operative at ahigher speed of rotation to move only, and centrifugally operated meansto engage said adjusted means to position fixedly said element withrespect to said cylindrical body at a higher speed of rotation.

9. In a rotary agitator for a suction cleaner, a cylindrical body formedwith a radial brush seat, a brush element slidingly seated in said seat,a rotatable element within said body, linkage connecting said brushelement to said rotatable ele ment to rotate the latter upon radialmovement of the former, and centrifugally operated means within saidbody to engage said rotatable element to move said brush elementradially inward a predetermined distance-at a predetermined speed ofrotation.

10. In a rotary agitator for a suction cleaner, a cylindrical bodyformed with a radial brush seat, a brush element slidingly seated insaid seat, a rotatable element within said body formed with teeth,linkage connecting said brush element to said rotatable element torotate the latter upon radial movement of .the former, a centrifugalweight mechanism having teeth, spring means acting upon said mechanismto cause teeth thereof to mesh with the teeth of said rotatable elementto prevent movement of said brush element, said centrifugal weightmechanism being adapted to move under centrifugal force at a position incontact with the abutting surface to a radially fixed operating positionand to lock it in suchoperating position.

16. In a rotary agitator for a suction cleaner, a brush element, meanssupporting said element for rotation and for radial movement relative tothe axis of rotation under centrifugal force, andagitator-rotation-actuated means to move said element radially inward aconstant and fixed distance only from the outermost position it assumesunder centrifugal force.

17. The construction defined in thel preceding claim in which saidagitator-rotation-actuated means also looks said element in position.

predetermined speed to disengage said teeth to permit said brush to moveradially outward under centrifugal force, teeth of said mechanismengaging the teeth of said rotatable element upon continued movement ofsaid mechanism under centrifugal force to rotate said element to' movesaid brush element radially inward to a'flxed position.

11. The construction defined in the preceding claim in which spaceddiametrically opposed brush elements are connected to and movable withsaid rotatable element.

12. In a rotary agitator for a suction cleaner, a brush element, meanssupporting said element for rotation and for radial movement relative tothe axis of rotation, means to lock said element at a radial positionduring agitator rotation, and means to effect the release of saidelement for radial movement upon the speed of agitator rotationdecreasing below a predetermined point.

13. In a rotary agitator for a suction cleaner, a brush element, meanssupporting said element for rotation and for radial movement relative tothe axis of rotation, a centrifugally actuated lock to maintain a radialsetting of said element, and means to render said lock ineffective withsaid agitator rotating at less than a predetermined speed.

14. In a rotary agitator for a suction cleaner, a brush element, meanssupporting said element for rotation and for radial movement relative tothe axis of rotation, agitator-rotation-controlled.

means to maintain said brush at a fixed radial 18. In a rotary agitatorfor a suction cleaner, a brush element, means supporting said elementfor rotation and radial movement relative to the axis of rotation undercentrifugal force, means connected to and rotatable upon radial movementof said element, and centrifugally operated v means to rotate saidrotatable means to move said element radially inward.

19. In a .rotary agitator for a suction cleaner, a brush element, meanssupporting said element for rotation and radial movement relative to theseat, a rotatable element in said body means connecting said brushelement to said rotatable element to rotate the latter upon radialmoveextension during operation, and means to renment of the-former, acentrifugal-weight-operated mechanism adapted to engage said rotatableelement to prevent movement thereof, spring means acting upon saidcentrifugal-weightoperated mechanism to urge it into engagement withsaid rotatable element, said centrifugalweight-operated mechanism beingadapted to move under centrifugal force to release said rotatableelement to permit said brush to move radially outward under centrifugalforce, said centrifugal-weight-operated mechanism being so constructedand arranged as to reengage said rotatable element upon continuedmovement of said mechanism under centrifugal force to fix the positionof said rotatable element and said brush element.

21. In a suction cleaner, a plurality of brush elements connected forconjoint radial movement, means to lock said elements at .a fixed radialextension at a constant speed of rotation, means to release saidelements for outward radial movement during acceleration of theagitator, and stationary means to limit the outward radial movement ofsaid elements.

22. In a rotary agitator for suction cleaners, a radially adjustableagitating element, means to release said element for radial movementbetween zero and fullspeed rotation, and means to lock said element at afixed position with said agitator rotating at full speed rotation.

23. A rotary agitator for suction cleaners rotatable about an horizontalaxis and comprising a radially fixed rigid beating element and aradially movable brushing element,'and centrifugally operated means tolock said brushing element in operative position at a predetermine speedof agitator rotation.

able about an horizontal axis, a rotatable body,

an agitating element mounted for radial movement' on said body andadapted to move outwardly under centrifugal force into a surfacecontacting. position, and means operative at a predetermined speed ofrotation to fix the radial position of said agitating element.

25. In a suction cleaner rotary agitator rotatable about an horizontalaxis, a rotatable bodv, an agitating element mounted for radial movementon said body and adapted to move outwardly under centrifugal force intoa surface contacting position, and centriiugal means operative at apredetermined speed of rotation to secure said agitating element in saidsurface contacting position.

26. In a rotary agitator for suction cleaners, a body rotatable about anhorizontal axis, a brush element mounted for radial movement on saidbody and adapted to move radially outward into WILFORD G. EULPATRICK.

CERTIFICATE OF. CORRECTION. V Patent No. 2,255,788. September 16, 19in.

WILFORD G. KILPATRICK.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring-correction s follows; Page 2,irst column, line 15, for withia read --within-:; and second column,line 15, for the reference numeral "I42" read "14.5"; page 5, firstcolumn; line 2, cla1m 8, for "adjusted" read -adjustable--; and'that thesaid Letters Patent should be read with this correction therein that thesame majy conform to the record of the case in the Patent Office. I Q

. Signed and sealed this hth' day of November, A. 1); 191 1.

Henry Van Arsdele 4 (Seal) Acting Commissioner of Patents.

